Antifriction bearing grease



paggz'mawaz United tates Pawn r ANTIFRICTION BEARING GREASE Henry A.Ambrose, Penn Hills Township, Allegheny County, and Paul R. McCarthy,Allison Park, Pa., assignors to Gulf Research 8; Development Company,Pittsburgh, Pa., a corporation of Delaware No Drawing. Filed Apr. 17,1958, Ser. No. 729,073

10 Claims. (Cl. 252-334) This invention pertains to high temperaturegreases and in particular to greases for lubricating roller and ballbearings operating at high temperatures.

High temperatures such as above 200 F. are frequently encountered inroller and ball bearings. When conventional greases are used tolubricate such bearings, the grease may melt and run out of the bearingin which case effective lubrication takes place only for a relativelyshortperiod of time. Conventional greases melting at high temperaturewill remain in such bearings but because of the high temperature willordinarily oxidize or polymerize forming hard gummy deposits whichincrease torque and finally result in breakdown of the bearing. Thisproblem is especially acute in connection with prepacked, sealedbearings which require effective lubrication over prolonged periods oftime, much of which is at elevated temperature.

This invention has for its object to provide an improved hightemperature grease. Another object is to provide a grease whichwilleifectively lubricate roller and ball bearings operating attemperatures above 200 F. over prolonged periods of time. Another objectis to improve the state of the art. Other objects will appearhereinafter.

These and other objects are accomplished by our invention which includesa grease comprising a lubricating oil, a sodium, lithium, barium orstrontium soap thickening agent and between about 5 and 30 percent ofAgents A, B, C or D described below.

AGENT A A mixture of (1) a member of the group consisting of calcium andbarium neutral and basic salts of a compound having the formula:

OH OH (wherein R represents any alkyl group containing between about 4and 20 carbon atoms and n is an integer of 1 to 4) and (2) a saltselected from the group consisting of calcium and barium sulfonates ofan alkylated aromatic hydrocarbon in which the alkyl groups contain atotal of between about 8 and 100 carbon atoms.

Specific examples of component (1) of Agent A are the following:

(i) The barium salt of tertiary octyl phenol sulfide having the formula:

(tart) CaHu CEHH (tart) 2,966,461 Patented Dec. 27, 1950 ICC (ii) Thebarium salt of tertiary amyl phenol sulfide having the formula:

l 5 (tart) mmO-s-Qoazn. (tert.)

10 (iii) The barium salt of stearylphenol sulfide having the formula:

CisHzn S C18H37 (iv) The barium salt of ditertiary butylphenol sulfidehaving the formula:

(tort) C4Hn S C4H9 (tart) 3 ($611.) 4H9 (tert.) 4H9 The barium salt ofdi-tert-octylphenol sulfide was prepared by the follbwing reaction andprocedure.

OBaO

reaction was being removed. The temperature was raised to about 300 F.for about one-half hour or until all water was removed. A small amountof filter aid was added with stirring to the hot oil solution and thesolid impurities removed by filtration. The oil solution consists ofapproximately 40 percent solution of the neutral barium salt of thetert-octylphenol sulfide. Examples of component (2) of Agent A are thefollowing:

Calcium petroleum sulfonate' Barium petroleum sulfonate Sodium petroleumsulfonate Calcium octyl benzene sulfonate Barium nonyl benzene sulfonateCalcium hexadecyl benzene sulfonate Calcium octadecyl benzene sulfonateCalcium wax-alkylated benzene sulfonate The two components of Agent Amay vary in amount between about 50 and percent of component (1) and 10to 50 percent of component (2). A satisfactory mixture is obtained byadding 63 parts of the barium .di-tertoctylphenol sulfide prepared asdescribed above to 37 parts of calcium petroleum sulfonate prepared asfollows:

One thousand four hundred fifty grams of an oil solution of the sodiumsalt of oil soluble petroleum sulfonic acids are agitated in 4000 ml. ofwater during the addition of a solution of 220 grams of calcium chloridein 1000 grams of water. The sodium petroleum sulfonates used in thisexample have an average molecular weight of 443 and the oil solutioncontains 62 percent by weight of the sulfonates. This reactionrepresents about 2 mols of sodium petroleum sulfonate with a very slightexcess of calcium chloride. After the reaction is completed, the excesswater is separated by decantationand the oil-solid mass washed with coldwater. The calcium salt-oil mass is added to 2400 grams of an SAE 20viscosity mineral oil together with about 25 grams of Ca(OH) to insurecomplete neutralization. The oil solution is dehydrated at about 300 F.and filtered. The resulting oil solution contains 1.35 percent calciumand the calcium content of the oil free active ingredient is 4.5percent, i.e. the oil solution contains 30 percent of the calciumpetroleum sulfonate.

AGENT B A mixture of (1) the product obtained by reacting P 5 with amember of the group consisting of the calcium and barium neutral andbasic salts of a compound having the formula:

having the formula:

I QBa-O CaHi'l (tert'h) S- (ii) The barium salt at tertiary am i phenolsulfide having the formula: M

OBa-0 I can (tertJOS-Ofhfiu (tel-t.)

(iii) The barium salt of stearylphenol sulfide having the formula:

OB a--O CisHa- O S -OCmH21 (iv) The barium salt of ditertiarybutylphenol sulfide having the formula:

OBa0 (tart) CEO-S-QQH. (at) (tert.) C4H9 (tert. C4 O Calcium or mixedbarium-calcium salts may be em- 4 ployed instead of the barium salt ineach of the above compounds.

The reaction with P 8 may be accomplished by dissolving the metal saltof the phenol sulfide in a solvent such as a lubricating oil and addingthe P 8 with heating and stirring. Proportions of between about 3 and 5parts of the metal salt of the phenol sulfide to one part of P 8 areemployed. The reaction mixture is heated and stirred at between about175 and 300 F. for a time period between about 2 and 3 hours. Thereaction may be carried out in the presence of solvents such aslubricating oil, heavy naphtha, benzene, etc. The reaction product maybe treated by blowing with a gas such as nitrogen in order to removehydrogen sulfide, filtered and air blown to remove any remainingvolatile sulfides.

Examples of component (2) of Agent B are the same substances mentionedin connection with component (2) of Agent A.

The two components of Agent B may vary in amount between about 50 andpercent of component (1) and 10 to 50 percent of component (2). Asatisfactory mixture constituting Agent B is obtained by reacting 40parts of the barium salt of ditertiary butyl phenol sulfide having theformula given in subparagraph (iv) above with 4 parts of P 8 in presenceof 60 parts of a solvent comprising SAE 20 grade lubricating oil at atemperature of 212 F. for a time of one-half hour and at 300 F. for anadditional 2 hours to obtain a product which consists essentially of alubricating oil solution containing about 40 percent by weight of thephosphorized barium tert- Qctylphenol sulfide as the active ingredient.This sulfide contained 23.8 percent barium and 5.55 percent sulfur.Sixty-three grams of the lubricating oil solution containing thisphosphosulfurized barium tert-octylphenol sulfide was blended with 37grams of a lubricating oil (.SAE,,20) so1ution containing as the activeingredient (component .2) about 3.5 ,percentby weight of the calcium.petroleumsulfonate prepared as described above in connection with AgentA.

AGENT c I product obtained by reacting P 8 with a terpene hydrocarbon.Examples of terpene hydrocarbons are pinene, d ipinene and terpinolene.The reaction between the, terpene and P 8 is carried out by reactingbetween about 3.5 and 4.5 parts of the terpene hydrocarbon with one partof P 8 The temperature during the reaction may be between about 205 and320 F. and preferably between about 210 and 255 F. The reactants areheated at this temperature for a period of time between about two hoursand five hours. It is desirable that the reaction be carried out in thepresence of a non-reactive solvent such as a hydrocarbon in thelubricating oil range. The reaction products may be employed as formedin the reaction mixture or the reaction mixture may be purified by anydesired method such as by filtering the warm oil solution in which casethe filtrate contains the desired agent. A composition representingAgent C was produced by reacting 4 parts of alpha pinene with 1 part ofP 5 at a temperature of 2lO-25 5 F. for 2 hours in the presence ofalubricating oil solvent having an SAE viscosity of 20. The reactionproduct was then filtered to obtain the lubricating oil solution of thedesired agent in an amount of 57 percent. The product contained 4.45percent phosphorus and 12.61 percent sulfur.

AGENT D A mixture of (l) the product obtained by reacting P 85 with aterpene hydrocarbon and (2) a salt selected from the group consisting ofbarium and calcium sulfonates of an alkylated aromatic hydrocarbon inwhich the alkyl groups contain a total of between about 8 and carbonatoms. Component (1) of Agent D is the same as the above described AgentC. Component (2) of Agent D is the same as component (2) of Agents A andB. Fifty to 80 percent of component (1) to 50 to 20 percent of component(2) is preferablyemployed in the mixture. A preferred specific mixtureis 4 parts of the reaction product of P 5 with a pinene prepared asdescribed in connection with Agent C and one part of barium paraflin waxalkylated benzene sulfonate solution prepared as follows:

A parafiin wax having an average of about 24 carbon atoms to themolecule and a melting point of 124127 F. was chlorinated at about 195F. with chlorine gas until the weight of the wax had increased aboutpercent. The chlorowax (10 percent Cl) thus obtained was then blown withnitrogen to remove any occluded chlorine and hydrogen chloride.

One thousand and twenty (1020) parts of the above chlorowax was thenreacted with 460 parts by weight of benzene in the presence of 65 partsof AlCl at about 140 F. for about two hours. The excess benzene was thendistilled 01f by warming to 240 F. with a stream of N gas bubblingthrough the mixture. The wax benzene thus formed as treated with anadditional 1020 parts of chlorowax and the mixture heated to 185 F.until the reaction stopped. It was allowed to stand overnight at about140 F. and then decanted from the settled AlCl sludge and filtered. Theproduct consisted essentially of di wax benzene.

Five thousand two hundred (5200) parts of the di wax benzene, preparedas described above, were treated with successive 250 parts of oleumcontaining 15 percent SO while maintaining the temperature at 95 -130 F.After 2600 parts of oleum had been added and the reaction had ceased,3000 parts of water were added while the mixture was thoroughly stirred.An SAE grade motor oil (5400 parts) was then added and the mixture wasallowed to settle over night at about 165 F. The lower layer, consistingmostly of dilute sulfuric acid, was with drawn leaving di wax benzenesulfonic acid in the upper layer. weight of barium hydroxideoctahydrate.

which represents an excess of barium hydroxide over that required toneutralize the di wax benzene sulfonic acid and any free sulfuric acidoccluded therein. The reaction mixture thus formed was heated to about285 F. for about six hours with nitrogen gas bubbling through it toremove water, and it was then filtered through a layer of clay. Theproduct consisted of approximately 50 percent oil blend of essentiallyneutral barium di wax benzene sulfonate.

The grease constituting our invention is prepared in known manner from alubricating oil and a sodium, lithium, barium or strontium soapthickening agent. The lubricating oil may be a hydrocarbon lubricatingoil or a synthetic lubricating oil. For instance di-Z-ethylhexylsebacate or azelate or glycol derivatives of the Ucon type are suitablesynthetic lubricating oils. In the event a hydrocarbon oil is used, itmay be derived from any mineral oil base such as Pennsylvania, MidContinent, etc. crudes and it may be refined by distillation, solventextraction, etc. The hydrocarbon oil should'have a viscosity of betweenabout 100 SUV at 100 F. and 2000 SUV at 100 F. The viscosity ispreferably between about 300 and 700 SUV at 100 F.

The sodium, lithium, barium or strontium soap employed to thicken thelubricating oil may be prepared from an organic acid having betweenabout 12 and 32 carbon atoms. The acid may be saturated or unsaturatedand may contain substituents such as hydroxyl groups. Aliphatic acidsare preferred. Examples of satisfactory acids are lauric, myristic,palmitic, stearic and arachidic. Mixtures of these acids or mixturesobtained by saponification of natural fats such as cottonseed oil, lard,tallow, etc. may be used. The soaps are formed by saponifying the acidor the fat with a sodium, lithium, barium or This upper layer wastreated with 3170 parts by barium hydroxide. The soaps are incorporatedin the lubricating oil in amounts up to about 50 percent by weight.Amounts of between about 5 to 25 percent are preferred.

The grease may be prepared using any of the well known greasemanufacturing procedures. A batch or continuous method of manufacturemay be used. One satisfactory method is the following:

(1) Saponify the fatty acids in a pressure vessel at 100-300 p.s.i. inthe presence of part (approximately 30 percent) of the lubricating oilat a temperature of about 320 F.

(2) Transfer the reaction product to an open kettle, dehydrate theresulting soap stock by heating in the open kettle and add the remainderof oil at a temperature between 300 and 420 F.

(3) Cool the mixture to a temperature of about 200 F.

(4) Add agent A, B, C or D. Stirr the mixture to incorporate theadditive.

(5) Either (a) pour the grease into containers at about 200 F., or (b)stirr the grease in the kettle while cooling it to a lower temperatureand then pour into containers, or (c) cool still further, mill as bypumping through a colloid mill followed by packaging.

Alternatively the detergent and/or antioxidant (i.e. Agent A, B, C or D)may be added to the contents of the grease kettleat any stage of theabove described dant is added in amounts between 5 and 30 percent andpreferably in amounts between 7.5 and 20 percent (based on weight of oilplus soap, not on total weight of finished grease).

Secondary additives may also be incorporated in the grease in order toimprove its properties. Thus rust reventives, extreme pressure agent-s,etc., may be added to obtain the required properties. From the foregoingit will be apparent that the grease constituting our invention shouldcontain between about 1 and 50 percent and preferably between about 5and 25 percent of the specified soap thickening agent, between about 5and 30 percent and preferably between about 7.5 and 20 percent of thedetergent and/or antioxidant listed above, the balance being lubricatingoil and minor amounts of other additives in case such other additivesare desired.

Table I presents data comparing the greases constituting the presentinvention with a conventional or base grease containing no detergent.Table II presents performance data on the base grease, the greases ofthe present invention and the base grease plus well known commercialdetergent additives. For these tests the base grease was prepared in aconventional manner by Saponifying a commercial stearic acid percentstearic and 10 percent palmitic) with sodium hydroxide. A hydrocarbonlubricating oil and a small amount of diphenylamine was incorporated inthe soap. The composition of this base grease was 68.65 percentlubricating oil, 24.67 percent fatty acids, 3.92 percent sodiumhydroxide, 1.74 percent glycerin and 1.02 percent diphenylamine. Thelubricating oil was a petroleumdistillate having the followingproperties:

Gravity API 29.8 Vis. SUV sec.:

F. 305 210 F. 54.5 Flash O.C., F. 455

each containing two No. 6210 ball bearings, mounted on two parallelspindles, one above the'other, and loaded through a system of levers andfulcrum plates by tangential contact of the wheels. The lower spindlewith its wheel is connected to the loading system, and the upperassembly is brought to bear upon the lower by turning down two largescrews until it counterbalances the chosen loading weight, which inthese tests was 1000 .pounds. To insure'a fixed temperature of 250 F.,the wheels are enclosed in an insulated box and heated bythermostatically controlled ring heaters surrounding the hubs. Acartridge heater in the rear of each spindle compensates for the heatloss through the heavy steel structure. Thermocouples are situated ingrooves in the spindles and contact each bearing. A pulley on the upperWheel and two appropriate holes in the side of the insulated box providefor a belt driven by means of a motor mounted on the outside. A singlecharge of grease (10 grams) is packed into each ball bearing. The testruns continue as long as the bearings remain lubricated by the originalcharge, but with several interruptions for inspections, to observedevelopments and changing conditions. Finally, the runs were terminatedand grease failure declared when the race paths are found to be dry, acondition sometimes signalized by a sudden temperature rise in thebearing.

8 We claim: 1. A grease compositionadapted to lubricate"attem peraturesabove about 200 Fcomprising a lubricating oil, an'amount sutficient'toform a grease of amember ing the formula:

OH OH Rn S n (wherein R represents any alkyl group containing'betweenabout 4 and 20 carbon atoms'and n is an integer of 1 to 4) and (2)between about and 50 percent of a salt selected from the. groupconsisting of barium and calcium sulfonates of an alkylated aromatichydrocarbon in which the alkyl groups contain a total of between about 8and 100 carbon atoms;

(B) a mixture of (1) between about 50 and 90 percent of the productobtained by reacting P S with a Table I Base Grease Containing BaseInspection Grease Additive Additive Additive Additive A B G D DroppingPoint, F., ASTM D' 566-42 443 393 396 372' 372 Penetration, ASTM D 212T: 7

Unworked 212 189 v 186 132 2% Worked 60 strokes- 222 238 254 180 243Worked 10,000 strokes. 268 280 292 "283 Worked 100,000 strokes 302 280284 311 323 Evaporation percent, AS'IM D i 51 0. 83 0. 79 0. 91 1. 28 1.Oil Separation, percent, Ni filter cone,

212 F. 50 hr 0. 47 0. 0. 85 0. 0 0. 0

member of the group consisting of the calcium and Table II v bariumneutral and bas1c salts of a compound havlng the formula:

Composition Tested Hours to OH OH Failure I Base grease 2, 899 Basegrease plus Additive A 3,609 Rn S Rn Base grease plus Additive B 6, 79250 Base grease plus Additive 0... 4,194 gase grease pins fidgitivleslgn7, 340 h R 1k 1 ase greasepus u llZO 5.. 2,757 am a 0 t Base grease plusLubrizol 338 2,625 (W r is y a y aroup S anPug between about Base gleaqeplus Lubmong 5,049 4 and 20 carbon atoms and n is an integer of 1 to 4)g g pig: and (2) between about 10 and 50 percent of a salt g p 5selected from thegroup consisting of barium and calcium It will be notedfrom the data in Tables I and II that the greases constituting thepresent invention had excellent characteristics including exceptionalability to lubricate at high temperatures over prolonged periods oftime. The invention is applicable only to greases in which sodium,lithium, barium or strontium soaps are employed as thickening agents. Wehave added 7.5 percent of the same detergents tested in Table I tosilica, Bentone, aluminum, and calcium greases having otherwise the samecomposition as the control grease mentioned in connection with Table I,and found that the resulting products were entirely unsatisfactory forhigh temperature use.

The present invention is not to be considered as limited by any of theexamples described herein which are given by way of illustration only,but it is to be limited solely by the terms of the appended claims.

This application is a continuation-in-part of our application Serial No.536,293, filed September 23, 1955, now abandoned.

sulfonates of an alkylated aromatic hydrocarbon in which the alkylgroups contain a total of between about 8 and 100 carbon atoms;

(C) the product obtained by reacting P 8 with a terpene hydrocarbon; and

.(D) a mixture of (1) between-about 50 and percentof'the productobtained by reacting P S with a terpene hydrocarbon; and (2) betweenabout 20 and 50 percent of a salt selected from the group consisting ofbarium and calcium sulfonates of an alkylated aromatic hydrocarbon inwhich the alkyl groups contain a total of between about 8 and 100 carbonatoms.

2. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubrieating oil, an amount sufficient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 5 and 30 percent of anadditive selected from the group consisting of: p

(A) a mixture of (1) between about 50 and .per-

mgsgm (wherein R represents any alkyl group containing between about 4and 20 carbon atoms and n is an integer of 1 to 4) and (2) between about10 and 50 percent of a salt selected from the group consisting of bariumand calcium sulfonates of an alkylated aromatic hydrocarbon in which thealkyl groups contain a total of between about 8 and 100 carbon atoms;

(B) a mixture of (1) between about 50 and 90 percent of the productobtained by reacting P with a member of the group consisting of thecalcium and barium neutral and basic salts of a compound having theformula:

OH OH R S Rn (wherein R is any alkyl group containing between about 4and 20 carbon atoms and n is an integer of 1 to 4) and (2) between aboutand 50 percent of a salt selected from the group consisting of bariumand calcium sulfonates of an alkylated aromatic hydrocarbon in which thealkyl groups contain a total of between about 8 and 100 carbon atoms;

(C) the product obtained by reacting P 5 with a terpene hydrocarbon; and

(D) a mixture of (1) between about 50 and 80 percent of the productobtained by reacting P S with a terpene hydrocarbon and (2) betweenabout 20 and 50 percent of a salt selected from the group consisting ofbarium and calcium sulfonates of an alkylated aromatic hydrocarbon inwhich the alkyl groups contain a total of between about 8 and 100 carbonatoms.

3. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubricating oil, an amount suflicient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 5 and 30 percent of amixture of (1) between about 50 and 90 percent of a member of the groupconsisting of calcium and barium neutral and basic salts of a compoundhaving the formula:

OH OH g 8 G (wherein R represents any alkyl group containing betweenabout 4 and 20 carbon atoms and n is an integer of 1 to 4) and (2)between about 10 and 50 percent of a salt selected from the groupconsisting of barium and calcium sulfonates of an alkylated aromatichydrocarbon in which the alkyl groups contain a total of between about 8and 100 carbon atoms.

4. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubricating oil, an amount suflicient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 5 .and 30 percent of amixture of (1) between about 50 and 90 percent of the product obtainedby reacting P 5 with a member of the group consisting of the calcium andbarium neutral and basic salts of a compound having the formula:

(wherein R is any alkyl group containing between about 4 and 20 carbonatoms and n is an integer of l to 4) and (2) between about 10 and 50percent of a salt selected from the group consisting of barium andcalcium sulfonates of an alkylated aromatic hydrocarbon in which thealkyl groups contain a total of between about 8 and 100 carbon atoms.

5. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubricating oil, an amount sufficient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 5 and 30 percent of theproduct obtained by reacting P 5 with a terpene hydrocarbon.

6. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubricating oil, an amount suflicient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 5 and 30 percent of amixture of (1) between about 50 and percent of the product obtained byreacting P 8 with a terpene hydrocarbon and (2) between about 50 and 20percent of a salt selected from the group consisting of barium andcalcium sulfonates of an alkylated aromatic hydrocarbon in which thea'lkyl groups contain a total of between about 8 and 100 carbon atoms.

7. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubricating oil, an amount sufiicient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 7.5 and 20 percent of amixture of (1) between about 50 and percent of a member of the groupconsisting of calcium and barium neutral and basic salts of a compoundhaving the formula:

OH OH Rn S Rn (wherein R represents any alkyl group containing betweenabout 4 and 20 carbon atoms and n is an integer of 1 to 4) and (2)between about 1-0 and 50 percent of a salt selected from the groupconsisting of barium and calcium sulfonates of an alkylated aromatichydrocarbon in which the alkyl groups contain a total of between about 8and carbon atoms.

8. A grease composition adapted to lubricate at tem peratures aboveabout 200 F. comprising a mineral lubricating oil, an amount sufiicientto form a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 7.5 and 20 percent of amixture of (1) between about 50 and 90 percent of the product obtainedby reacting P S with a member of the group consisting of the calcium andbarium neutral and basic salts of a compound having the formula:

OH OH Rn S B,

(wherein R is any alkyl group containing between about 4 and 20 carbonatoms and n is an integer of -1 to 4) 11 and (-2) between about 10 and50 percent of a salt selected from the group consisting of barium andcalcium sulfonates of an alkylated aromatic hydrocarbon in which thealkyl groups contain a total of between about 8 and 100 carbon atoms.

9. A grease composition adapted to lubricate at temperatures above about200 F. comprising a mineral lubricating oil, an amount sufiicient toform a grease of a member of the group consisting of sodium, lithium,barium and strontium soaps and between about 7.5 and 20 percent of theproduct obtained by reacting P 8 with a terpene hydrocarbon.

10. A grease composition adapted to lubricate at temperatures aboveabout 200 F. comprising a mineral lubricating oil, an amount sufficientto form a grease of a member of the group consisting of the lithium,

barium and strontium soaps and between about 7.5 and percent of amixture of (1) between about and percent of a product obtained byreacting P 8 with a terpene hydrocarbon and (2) between about 20 and 50percent of a salt selected from the group consisting of barium andcalcium sulfonates of an alkylated aromatic hydrocarbon in which thealkyl groups contain a total of between about 8 and carbon'atoms.

References Cited in the file of this patent UNITED STATES PATENTS2,394Q790 Liehe Feb. 12, 1946 2,416,281 Berger et a1. Feb. 25, 19472,451,345 McNab et a1. Oct. 12, 1948 2,813,077 Rogers et al. Nov. 12,1957

1. A GREASE COMPOSITION ADAPTED TO LUBRICATE AT TEMPPERATURES ABOVEABOUT 200*F. COMPRISING A LUBRICATING OIL, AN AMOUNT SUFFICIENT TO FORMA GREASE OF A MEMBER OF THE GROUP CONSISTING OF SODIUM, LITHIUM, BARIUMAND STRONTIUM SOAPS AND BETWEEN ABOUT 5 AND 30 PERCENT OF AN ADDITIVESELECTED FROM THE GROUP CONSISTING OF: (A) A MIXTURE OF (1) BETWEENABOUT 50 AND 90 PERCENT OF A MEMBER OF THE GROUP CONSISTING OF CALCIUMAND BARIUM NEUTRAL AND BASIC SALTS OF A COMPOUND HAVING THE FORMULA: